| 1 | # |
| 2 | /* UCB rmtree |
| 3 | * rmtree dir . . . |
| 4 | * author: Kurt Shoens |
| 5 | * recursively removes files and directories |
| 6 | * in a subtree. The -v flag prevents it from |
| 7 | * removing the final directory, ie the one |
| 8 | * you specify. The incredible danger of |
| 9 | * this program must by now be apparent to you. It |
| 10 | * asks you if you are sure on each argument. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #define ENOTDIR 20 |
| 15 | #define ENOENT 2 |
| 16 | |
| 17 | #define STACKSIZE 1024 |
| 18 | |
| 19 | int vflag; |
| 20 | int errs; |
| 21 | int fflag; |
| 22 | int cflag; |
| 23 | int active; |
| 24 | |
| 25 | /* set warnflag true to get "last chance before . . . " */ |
| 26 | |
| 27 | int warnflag 1; |
| 28 | |
| 29 | char pathname[STACKSIZE]; |
| 30 | |
| 31 | char *pathptr; |
| 32 | char *myname; |
| 33 | |
| 34 | extern errno; |
| 35 | |
| 36 | main(ct,av) |
| 37 | char **av; |
| 38 | { |
| 39 | int level,i,thiser; |
| 40 | char crap[36]; |
| 41 | setuid(getuid()); |
| 42 | myname = av[0]; |
| 43 | /* |
| 44 | * if (getuid()) |
| 45 | * { |
| 46 | * printf("sorry, not super user\n"); |
| 47 | * exit(1); |
| 48 | * } |
| 49 | */ |
| 50 | if (ct<2) |
| 51 | { |
| 52 | usage(myname); |
| 53 | exit(9); |
| 54 | } |
| 55 | for (i=1;i<ct;++i) |
| 56 | { |
| 57 | if (*av[i] == '-') |
| 58 | { |
| 59 | process(av[i]); |
| 60 | continue; |
| 61 | } |
| 62 | ++active; |
| 63 | if (stat(av[i],crap)) |
| 64 | { |
| 65 | perror(av[i]); |
| 66 | errs++; |
| 67 | continue; |
| 68 | } |
| 69 | if (!dir(av[i])) |
| 70 | { |
| 71 | errno = ENOTDIR; |
| 72 | perror(av[i]); |
| 73 | errs++; |
| 74 | } |
| 75 | else |
| 76 | { |
| 77 | if (warning(av[i],warnflag && !fflag)) |
| 78 | { |
| 79 | if (cflag && !vflag) chmod(av[i], 0700); |
| 80 | pathptr = pathname; |
| 81 | pushstr(av[i]); |
| 82 | thiser = descend(); |
| 83 | errs =+ thiser; |
| 84 | if (!vflag && !thiser) errs =+ rmdir(av[i]); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | if (!active) |
| 89 | { |
| 90 | usage(myname); |
| 91 | exit(9); |
| 92 | } |
| 93 | exit(errs); |
| 94 | } |
| 95 | |
| 96 | descend() |
| 97 | { |
| 98 | int offset,j,err,markerr,xcnt; |
| 99 | static f,inum,*ip; |
| 100 | register char *cp; |
| 101 | char name[16]; |
| 102 | markerr=0; |
| 103 | offset=16; |
| 104 | f=open(pathname,0); |
| 105 | if (f==-1) |
| 106 | { |
| 107 | prs(pathname); |
| 108 | prs(": no read permission\n"); |
| 109 | return(1); |
| 110 | } |
| 111 | j=read(f,name,16); |
| 112 | xcnt=0; |
| 113 | while (j) |
| 114 | { |
| 115 | ip=name; |
| 116 | inum= *ip; |
| 117 | if (!scomp(&name[2],".") && !scomp(&name[2],"..") && inum) |
| 118 | { |
| 119 | if (!xcnt++) if (access(pathname,3)) |
| 120 | { |
| 121 | prs(pathname); |
| 122 | prs(": need both X and W permission\n"); |
| 123 | close(f); |
| 124 | return(1); |
| 125 | } |
| 126 | pushstr(&name[2]); |
| 127 | if (dir(pathname)) |
| 128 | { |
| 129 | close(f); |
| 130 | if (cflag) chmod(pathname, 0700); |
| 131 | err=descend(); |
| 132 | if (!err) rmdir(pathname); |
| 133 | else markerr=1; |
| 134 | popstr(); |
| 135 | f = open(pathname,0); |
| 136 | seek(f,offset,0); |
| 137 | } |
| 138 | else |
| 139 | { |
| 140 | |
| 141 | /* if unlink fails, keeps going ?? */ |
| 142 | |
| 143 | if (rm(pathname)) markerr=1; |
| 144 | popstr(); |
| 145 | } |
| 146 | } |
| 147 | j=read(f,name,16); |
| 148 | offset=offset+16; |
| 149 | } |
| 150 | close(f); |
| 151 | return(markerr); |
| 152 | } |
| 153 | |
| 154 | rmdir(str) |
| 155 | char *str; |
| 156 | { |
| 157 | int p; |
| 158 | p = fork(); |
| 159 | if (!p) |
| 160 | { |
| 161 | execl("/bin/rmdir","rmdir",str,0); |
| 162 | perror("/bin/rmdir"); |
| 163 | exit(1); |
| 164 | } |
| 165 | else wait(&p); |
| 166 | return(p); |
| 167 | } |
| 168 | |
| 169 | rm(f) |
| 170 | char *f; |
| 171 | { |
| 172 | if (quota(f) && vflag) return(1); |
| 173 | if (unlink(f)) |
| 174 | { |
| 175 | perror(f); |
| 176 | return(1); |
| 177 | } |
| 178 | return(0); |
| 179 | } |
| 180 | |
| 181 | popstr() |
| 182 | { |
| 183 | --pathptr; |
| 184 | while (*pathptr != '/') --pathptr; |
| 185 | while (*pathptr == '/') --pathptr; |
| 186 | *++pathptr = 0; |
| 187 | } |
| 188 | |
| 189 | dir(n) |
| 190 | char *n; |
| 191 | { |
| 192 | struct inode { |
| 193 | char minor; /* +0: minor device of i-node */ |
| 194 | char major; /* +1: major device */ |
| 195 | int inumber; /* +2 */ |
| 196 | int flags; /* +4: see below */ |
| 197 | char nlinks; /* +6: number of links to file */ |
| 198 | char uid; /* +7: user ID of owner */ |
| 199 | char gid; /* +8: group ID of owner */ |
| 200 | char size0; /* +9: high byte of 24-bit size */ |
| 201 | int size1; /* +10: low word of 24-bit size */ |
| 202 | int addr[8]; /* +12: block numbers or device number */ |
| 203 | int actime[2]; /* +28: time of last access */ |
| 204 | int modtime[2]; /* +32: time of last modification */ |
| 205 | } buf; |
| 206 | if (stat(n,&buf)) return(0); |
| 207 | return((buf.flags & 060000) == 040000); |
| 208 | } |
| 209 | |
| 210 | quota(n) |
| 211 | char *n; |
| 212 | { |
| 213 | struct inode { |
| 214 | char minor; /* +0: minor device of i-node */ |
| 215 | char major; /* +1: major device */ |
| 216 | int inumber; /* +2 */ |
| 217 | int flags; /* +4: see below */ |
| 218 | char nlinks; /* +6: number of links to file */ |
| 219 | char uid; /* +7: user ID of owner */ |
| 220 | char gid; /* +8: group ID of owner */ |
| 221 | char size0; /* +9: high byte of 24-bit size */ |
| 222 | int size1; /* +10: low word of 24-bit size */ |
| 223 | int addr[8]; /* +12: block numbers or device number */ |
| 224 | int actime[2]; /* +28: time of last access */ |
| 225 | int modtime[2]; /* +32: time of last modification */ |
| 226 | } buf; |
| 227 | if (stat(n,&buf)) return(0); |
| 228 | return((buf.flags & 060000) == 020000 && buf.addr[0] == -1); |
| 229 | } |
| 230 | |
| 231 | scomp(n1,n2) |
| 232 | char *n1,*n2; |
| 233 | { |
| 234 | char left,right; |
| 235 | left= *n1; |
| 236 | right= *n2; |
| 237 | while (left && right) |
| 238 | { |
| 239 | if (left!=right) return(0); |
| 240 | ++n1; |
| 241 | ++n2; |
| 242 | left= *n1; |
| 243 | right= *n2; |
| 244 | } |
| 245 | return(left==right); |
| 246 | } |
| 247 | |
| 248 | actual(str) |
| 249 | char *str; |
| 250 | { |
| 251 | register char *f; |
| 252 | register slash; |
| 253 | f = str; |
| 254 | if (*f == '/') return(f); |
| 255 | slash = 0; |
| 256 | while (*f) if (*f++ == '/') slash++; |
| 257 | if (!slash) return(str); |
| 258 | while (*f != '/') --f; |
| 259 | ++f; |
| 260 | return(f); |
| 261 | } |
| 262 | |
| 263 | warning(file,f) |
| 264 | char *file; |
| 265 | { |
| 266 | char line[20]; |
| 267 | if (!f) return; |
| 268 | if (gtty(0,line)) return; |
| 269 | printf("last chance before OBLITERATING %s\n",file); |
| 270 | printf("ok? "); |
| 271 | line[read(0,line,20)] = 0; |
| 272 | return(*line == 'y' || *line == 'Y'); |
| 273 | } |
| 274 | |
| 275 | process(str) |
| 276 | char *str; |
| 277 | { |
| 278 | while (*str) switch(*str++) |
| 279 | { |
| 280 | case 'c': |
| 281 | cflag++; |
| 282 | break; |
| 283 | |
| 284 | case 'v': |
| 285 | vflag = 1; |
| 286 | break; |
| 287 | |
| 288 | case 'f': |
| 289 | fflag = 1; |
| 290 | break; |
| 291 | |
| 292 | case 's': |
| 293 | fflag = 0; |
| 294 | break; |
| 295 | |
| 296 | case 'a': |
| 297 | vflag = 0; |
| 298 | break; |
| 299 | |
| 300 | case '-': |
| 301 | break; |
| 302 | |
| 303 | default: |
| 304 | printf("unknown switch: %c\n", *--str); |
| 305 | exit(1); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | usage(str) |
| 310 | char *str; |
| 311 | { |
| 312 | printf("Usage: %s [ -acfsv ] dir ...\n",str); |
| 313 | errs++; |
| 314 | } |
| 315 | |
| 316 | prs(str) |
| 317 | char *str; |
| 318 | { |
| 319 | register char *f; |
| 320 | f = str; |
| 321 | while (*f) ++f; |
| 322 | write(2, str, f-str); |
| 323 | } |
| 324 | |
| 325 | pushstr(str) |
| 326 | char *str; |
| 327 | { |
| 328 | if (pathptr != pathname) *pathptr++ = '/'; |
| 329 | while (*pathptr++ = *str++) if (pathptr >= pathname + STACKSIZE) |
| 330 | panic("path name too long"); |
| 331 | pathptr--; |
| 332 | } |
| 333 | |
| 334 | panic(str) |
| 335 | char *str; |
| 336 | { |
| 337 | prs("PANIC: "); |
| 338 | prs(str); |
| 339 | prs("\n"); |
| 340 | exit(1); |
| 341 | } |